Electric signaling apparatus for telephone-lines



(No Model.)

D. DRAWBAUGH.

. AELEOTRIO SIGNALING APPARATUS FOR TELEPHONE LINES.

No. 276.136. Patented Apr. 17, 1883.

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UNITED STATES PATENT 01mins.

DANIEL DRAWBAUGH, OF EBERLYS MILL, PENNSYLVANIA, ASSIGNOR TO THE PEOPLE. TELEPHONE COMPANY, OF NEW YORK.

ELECTRIC SIGNALING APPARATUS FOR TELEPHONE-LINES.

SPECIFICATION forming part of Letters Patent No. 276,136, dated April Application filed January 18, 1883. (No model.)

To all whom it may concern:

Be it known that I, DANIEL DRAWBAUGH, of Eberlys Mill, Cumberland county, State of Pennsylvania, have invented a new and.

5 useful Improvement in Electric Signaling Apparatus for Telephone-Lines, of which the following is a specification.

The invention consists in an electric bell of particular construction and an apparatus for producing magneto-electric currents for operating said bell, the arrangement being specially adapted to serve as a call signal or alarm in connection with telephone-lines, although it may be used for other purposes. In the accompanying drawings, Figure 1 shows a plan view of the magnetoelectric apparatus for producing the current, and also a vertical section of the hell on line no a: of Fig. 2. Fig. 2 is a plan view of the bell on line y y of Fig. 1, and a side elevation of the magneto-electric apparatus.

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A is a compound permanent 1naguet,which 1 here show as formed of twoleaves. Between Q5 said leaves and at the poles of the magnet are inserted the flattened ends of two soft-iron cores, B, said cores being secured in place by screws 0. The bodies of the cores project inward and stand at right angles to the arms of the magnet. Said bodies are of cylindrical form, and between their inner or pole ends, D, there is a space, preferably, of about onequarter of an inch. Around the cores are placed coils of insulated wire, E, the said coils being connected.

F is an armature-wheel having, as here shown, six radial arms, and mounted on a shaft, G. The shaft G is held by the pins or screws H, entering socketsin itsouter extremities. The screws H may pass through brass blocks held between the leaves of the magnet A.

J is a pinion on shaft G, which pinion engages with a gear wheel, I, the shaft of which passes through a sleevebracket, K, and is provided at its outer end with a crank, M. Bracket K is secured to the magnet A by the screw L.

It will be seen that by turning the crank M the gear-wheel I, through the pinion J, rotates the shaft G, whereby the arms of the armaturew'neel F are caused to pass rapidly between the inner ends, D, of the cores B. The effect of this is to cause currents of electricity to be induced in the coils E, a direct and a reverse current being produced on the passage of'eaeh arm of the armature-wheel F through the space between the ends D of the coils. It follows,theret'ore,that with an armature-wheel having six arms, as here shown, twelve currents will be induced in the coils, said currents moving alternately in opposite directions ateach complete revolution ofsaid wheel. I do not limit myself to an armature-wheel having the particular number of arms here shown, inasmuch as that number may be increased ordiminished, as desired. Neither do I limit myself to the particular arrangement of gearing as shown for rotating said arma tore-wheel, inasmuch as other arrangements may be adopted to secure the same results.

The electric bell to be operated by the can rents, produced as above described, is constructed as follows: Q is a base or standard, hollowed out in cup form to receive the arch of the bent magnet N, which is secured in a vertical position by means of the screw 0, entering the nut or block Y. In said block Y, which may be of brass, is fastened, by solder or otherwise, the spring S, on the upper end of.

which is attached the armature T. To the ends of the magnet N are attached soft iron cores U, which project at right angles to and between the arms of the magnet. Surrounding said cores are coils V, of insulated wire. P is a standard attached by screws or other convenient means to the base Q, and serving to support the bell W. To the upper end of the armature T is fastened, by passing through an eye in said armature or otherwise, the bellhammer X. The armature T passes between the poles of the cores U. Said cores may be brought neaser together or further apart by means of the rod Z, which is fastened in one arm of the magnet at a and passes loosely through an'aperture in the spring S and in the other arm,and is provided with a nut, It, working in its threaded extremity. By turning the nut R in one direction the two arms of the magnet are pressed toward each other, and by turning it in the opposite direction theyarc allowed to spring apart. The free ends of the wires forming the coils E of the magneto-electric apparatus are secured to the binding-screws l 2 0f the bell, and said binding screws are also connected, two ends of the wires passingaround the bell-coils V. The other ends of the wires of the coils V are joined together, so that there is a complete circuit extending through the coils E and the coils V. The cores U of the bellcoils V are permanently polarized by iiiductionfrom theinaguetN. Oonsequentlywhen a current is passed through said coils V the magnetism ot'one core is neutralized, while that of the other is strengthened, and the latter attracts the armature toward it. The movement of the armature toward one or the other core depends, obviously, upon the direction of the current, a direct current causing it to be attracted in one direction, a reversed current in the other.

It has already been explained that whenever an arm ofthe armature-wheel F passes between the cores 0 two currents are generated in the coils E, and hencein the circuit in which they are placed, one current being direct, the other reversed. The result of these currents alternately affecting the bell armature is to move it first in one direction and then in the other, and thus to cause each end of the bell-hammer to strike the bell in turn. There will therefore occur for each revolution of the armature-wheel F, having six arms, twelve strokes on the bell.

.lt will be seen that inasmuch as by this arrangement I obtain a peal by single rotation of the armature-wheel itis not necessary to rotate the latter at very high speed to obtain acontinuously-sounding alarm, as is the case with other apparatus for making signals by magnctoclectric currents. The multiplyinggearing for rotating the armature can consequently be simple and easily made, and its presence for all practical purposes is not a necessity. I have found that the armature-wheel can be rotated by acrank-arm applied directly to its shaft with all necessary velocity t'or'signaling purposes; but to secure a uniformly continuous'and loud peal inultiplying-gearing, substantially as shown, is preferably used.

I claim as my invention-- 1. In combination with an apparatus for producing alternating currents in an electric circuit,apermanentmagnetofsubstantiallyhorseshoe form having a pole-piece attached to the inner side of each ot'its arms and at right angles thereto, coils of insulated wire surround ing said pole-pieces and included in thecircuit, and an armature of inductive material ar ranged 'and supported between the inner ends of said pole-pieces, substantially as described.

2. In combination with an apparatus for producing alternating currents in an electric circuit,apermanentmagnetotsubstantiallyhorseshoe i'orm having a pole-piece attached to the inner side of each of its arms and at right angles thereto, coils ot'insulated wire surrounding said pole-pieces andincluded in the circuit, an armature of inductive material arranged and supported between the inner ends ofsaid polepieces, and a means actuated or controlled by the movements of the said armature for producing a signal or alarm, substantially as described.

3. The combination of a permanent magnet of substantially horseshoe form and having a pole-piece attached tothe inner side of each of its arms and at right angles thereto, coils of insulated wire surrounding said pole'pieces, an armature of inductive material arranged between said pole-pieces, and a means for adjusting the said pole-pieces nearer to or farther from said armature, substantiallyasdcscribed.

A. In a magneto electric machine, the combination of a permanent magnet ot' substantially horseshoe t'orm having a pole-piece attached to the inner side of each of its arms and at right angles thereto, coils of insulated wire surrounding said pole-pieces, an armature of inductive material, and a. means for moving said armature through the space between the inner ends of the pole-pieces, substantially as described.

5. In a magneto-electric machine, the combination of a permanent magnet of substantially horseshoe form and having a pole-piece attached to the inner side of each of its arms DANIEL DRAAVBAUG H.

Witnesses:

Gino. KUNKEL, M. W. J AOOBS. 

